Hi Mitch & Joel,

the envelope needs an input like so:

Step n => Envelope e => SinOsc c => dac;

n.next(1); // you need to put something in the envelope to have a value at the output

c.gain(0.1);

e.value(100);
e.target(1000);
e.duration(1::second);

hour => now;

Hope this helps,
Casper

On Sep 4, 2015, at 03:25, Joel Matthys <jwmatthys@gmail.com> wrote:

Hi Mitch. Yeah, I couldn't get sync to work for frequency either. I guess we should file that as a bug.

The only refinements I would make is to put the code to update the envelope in a separate thread and spork it.

Envelope e => blackhole;
440 => e.value;
SinOsc s => dac;
0.1 => s.gain;
100::ms => e.duration;

spork ~gliss (100::samp);
while (1)
{
  Math.random2(220,880) => e.target;
  second => now;
}

fun void gliss(dur updateRate)
{
  while (1)
  {
    e.value() => s.freq;
    updateRate => now;
  }
}

//------------------------------------------------------------

On 09/03/2015 07:13 PM, Mitch Kaufman wrote:
Hi list,

I am a relatively new user and am enjoying exploring different areas of ChucK.  I was trying to develop a program to create glissons or short particles with a moving frequency range.  I came up with an approach but I think there may be an easier way.  Here is the program:

SinOsc sin => dac;
Envelope env => blackhole; 
500.0 => sin.freq => float x;  //starting frequency
100::ms => dur rampTime;  //ramp time period
0 => env.value;  //starting value
rampTime => env.duration;
400.0 => env.target;  //ramp to target - in this case, 900 Hz
now + rampTime => time t;
while( now < t )
{
    // modulate frequency by envelope
    x+env.value() => sin.freq;
    // advance time by 100 samples
    100::samp => now;
}

I think there may be an easier way of doing this using:

Envelope env => SinOsc sin => dac;

But I can't seem to get it working using a proper sin.sync value.  Does anyone have any ideas on improving the approach?

Regards,
Mitch


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